D ryersGROUP

TM

www.raj-dryers.com

ryers

D r y i n g S y s t e m s

AJ offers different types of drying systems depending on the nature of products to be dried and the characteristics of dried product required.

The drying systems are designed for one-step transformation of liquid feeds/ wet cakes/ pastes to powder. Depending on the nature of product the suitable material of construction is selected for product contact parts. The system is supplied as a turnkey equipment consisting of following systems. Slurry preparation/ Mixing / Feeding System. Air heating system. Feed atomization/ dispersion/ agitation system. Dry product collection / conveying system. Dust / Fines collection system consisting of either one or

combination of following systems. High efficiency cyclone separator. Bag filter. Wet scrubber. Electrostatic precipitator. Instrumentation and Controls comprising of simple motor

control center and indicating and controlling instruments. Option of PLC & SCADA controlled system for automatic operation of the complete plant is also offered.The drying systems are either open loop, semi closed loop or closed loop depending on the nature of solvent in the feed and the necessity of recovering the solvent.Depending on the nature of feed following types of drying systems are offered.

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Dryers

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pray dryers are offered for feeds in liquid form containing either water or any other solvent. Feeds may be solution, slurry or emulsion. Depending on the particle size of the final product required and the nature of feed any one or combination of following atomization system is used.

Two fluid atomization.

High pressure single fluid atomization.Rotary disc atomization.

The final product obtained from spray dryer is in powder form. By varying the operating parameters of the spray dryer the required powder characteristics such as moisture, particle size, bulk density, flowability, Particle Morphology etc. can be achieved.

Besides manual and semi-automatic systems we offer PLC & SCADA based systems for easy operation and monitoring of spray dryer. Multiple systems can be operated from a single computer thus reducing the manpower requirement. All the important parameters like temperatures, pressures, flow etc. are recorded and displayed in the system and can be retrieved at any given moment.

Capacity: The spray dryers having water evaporation capacity ranging from 1kg/hr to 18,000 kg/hr can be offered and supplied.

Operating temperatures: The spray dryers 0having operating temperatures up to 1100 C

can be offered and supplied.

CIP Systems: We offer integrated cleaning in place (CIP) systems in the spray dryers for automatic and fast cleaning of the complete system. This feature is essential where multiple products are dried in a single system and frequent washing is required.

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Typical applications of spray dryer are Dyestuffs, pigments, starch, detergents, milk powder, fruits, pharmaceutical, herbal extracts, food flavors, ceramics, china clay, enzymes etc.

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F l a s h D r y e r s

Cage Mill Flash DryerThis consists of a vertical pin type rotary and stationary cages. The wet feed is fed at the center of the rotating cage, where it comes in contact with hot air. The rotating cage disperses the feed while drying.Due to very low residence time in the range of 0.5 to 2 seconds in the flash dryers, heat sensitive products can be easily dried without degradation.Particle size of the final product can be controlled by installing a particle size controller which recycles the larger particle size back to the agitator and allows only the pre-determined size particles to be discharged as product.

Capacity: We can offer the flash dryers having capacities of 10kg/hr to 5000kg/hr evaporation rate.

Applications: Typical applications of flash dryer are starch, bagasse, minerals, pigments and dyes, phosphates, etc.

Spin Flash DryerThis consists of a horizontal agitator, which disperses the feed while it comes in contact with the hot air and gets dried.

lash dryers are used for drying of wet cakes which are sensitive to heat. There are different variations of flash dryers available depending upon the need to disperse the wet cake or pastes. These are:

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Dryers

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R o t a r y D r y e r s / C a l c i n e r s

R otary dryers are used for drying wet powders and cakes, which are easily breakable and dispersible. The rotary dryer consists of a rotating drum with angle lifting blades which lift the feed as the drum rotates and showers it in the stream of hot air flowing through the drum.

The rotary dryers can be used as calciners using direct or indirect firing.

GMP plants are offered for pharmaceutical, food, and biochemical applications.

Capacity: We can offer the rotary dryers with capacity range from 100kg/hr to 50000kg/hr product rate and operating temperatures up

0to 600 C.

Applications: Typical applications of rotary dryers include silica sand, bagasse, minerals, coconut powder, etc.

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he process air is supplied to the bed through a special perforated distributor plate and flows through the bed of solids at a velocity sufficient to support the weight of particles in a fluidized state. Bubbles form and collapse within the fluidized bed of material, promoting intense particle movement. In this state, the solids behave like a free flowing boiling liquid

Advanced method of drying wet/semi wet solids

Unlike in Tray Drying every solid particleis floating in the HOT STREAM of Air which is blown from down to up creatingmaterial layer in fluidised state

Almost every wet particle directly receives the heat energy from hot Air resulting in uniform and quick drying

Features of RAJ Continuous Fluid Bed Dryers:

Very versatile process equipment for uniform and efficient drying of products.

Fully automatic operation based on PLCcontrol / without PLC control

Minimum handling and more hygienic Lifting & tilting device of product container

for easy handling Option - steam heated or electric heated

blower cGMP model with documentation as

option.

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C o n t i n u o u s F l u i d B e d D r y e r

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Dryers

Material of Construction:Carbon Steel, SS 304 / SS 316 / Custom made.

Accessories:Heat recovery unit can be incorporated, cyclone, bag filters, multiclones, wet scrubber

Applications:Chemical / Fertilizer / Food - salt, sugar / Mineral - Sand, Aluminum / Ore calcining / Metal oxidation / Sludge Incineration / Pyrolysis of Plastic Waste / Pigment etc.

Capacity: Capacity available from 5 kg/hr to 2000 kg/hr water/solvent evaporation.

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perating PrincipleThe wet feed is continuously agitated by the heated rotating blades, thus exposing new areas to heating surfaces. This results in the moisture boiling off and rendering the wet material dry to the required degree.

Features of RAJ Paddle Dryer:

Low running cost – contact dryer.

Continuous production machine without human touch.

Ideal for solvent recovery.

Suitable for Crystalline material.

On-line particle size reduction – no separate pulverizer required.

Factory assembled & tested.

Compact construction – less floor area.

Choice of heating medium – steam, hot water.

Minimum exhaust air quantity – no elaborate air cleaning equipment needed.

Absence of high speed rotating parts – less breakdowns.

Special paddle form – ploughing and self cleaning action.

Initial particle size is maintained.

Typical Applications

Crystaline Solids Pasty Solids Sludge Agro Waste Magnesium Carbonate Polypropylene Beads

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P a d d l e D r y e r s

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team Tube Bundle Dryers are based on the conduction mode for drying. The product to be heated and dried only contacts steam-heated tubes, and not directly steam. Tube bundles are operated on the counter-flow principle (i. e. steam flows in the direction opposite t0 the direction of the material flow). The Tube Bundle Dryers are designed by considering the wet and dry product flow characteristics, lump crust formation tendency and thermal sensitivity of the material in dry condition.

Indirect Steam Tube Rotary Dryer

In Indirect Steam Tube Rotary Dryer the tubes are arranged in a circumferential manner on the inner periphery of the rotating shell. This entire shell and tubes assembly is supported on tyres / rollers & driven through

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Dryers

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suitable gear drive. Wet feed material is fed through material inlet nozzle installed at one end of the shell of dryer. This wet feed is fed through Screw Feeder. Feed material showered on the tubes with the help of lifting blades which are mounted on the rotating shell. Steam enters in the tubes through rotating joint installed at material discharge end of the shell. Material gets dried & discharged from the material discharge ports on the shell. Vapours are removed from the feed end with the help of suction blower after separating fines in the cyclone separator.The suitable sealing arrangement is provided to prevent air leakage and product losses.

Rotary Tube Bundle Dryers

In Rotary Tube Bundle Dryer the Tube Bundle is rotated inside the stationary insulated housing. Steam is passed though one end of Tube Bundle for drying and condensate is removed from the other end. Wet feed Material to be dried is fed into the stationary dryer housing from Feed Nozzle at one end. The material gets lifted up & showered on tubes with the help of lifting blades provided on tube bundle periphery. Material gets dried by conduction heat transfer & it is discharged from the other end.

RAJ offers customized configurations of Steam Tube Dryers.

Vapor Exhaust : Natural Draft / Induced Draft.

Fines Recovery : Cyclones / Bag Filters / Settling Chambers.

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Heating Media : Steam / Hot Oil.

Feed preconditioning, Product back-mixing systems.

Feed & product handling, conveying systems.

Features of the RAJ Steam Tube Bundle Dryer :

Operation is fully automatic with low maintenance.

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Reduced wear and tear of parts. Less space requirements.Minimum air flow giving the reducedoutput of waste air.Fire risk eliminated.Simple installation & robust Construction.Safe Operation.Low temperature drying for high qualityproducts to avoid losses of vitamins,nutrients and taste change.Mild steel or stainless steel andconstructions as required

Starch Industry : Drying of corn germs: corn fodder and corngluten.

as well as wheat fibre with wheat bran and syrup.

Distillery Industry : Drying of distillers grains.

Extraction Industry : Conditioning of broken soya beans, sunflower seeds,

whole or flaked rape and other oilseeds. Pre -

desolventizing of oilseed coarse meal prior to the toaster.

Drying of oilseed coarse meal after the toaster.

Brewing Industry : Drying of spent grains.

Chemical and : Drying of granulates,

Plastics Industries

Wood processing industry : Drying of wood chips.

Environment processing : For disposal of liquid sewage,

waste water and paper sludge.

Other : In many of these cases the materials viscosity is improved

by partial recycling.

Applications :

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otary Vacuum Dryer consists of cylindrical jacketed vessel with a central agitator having specially designed blades. In Rotary Vacuum Dryers the indirect heating is achieved by circulating hot water, Thermic oil or steam through the jacket. The agitator design is optimized so as to bring every particle in contact with the heated surface while rotating. This helps to achieve uniform temperature throughout the batch thereby preventing the re-condensation inside the drying chamber since there are no cold spots, and contributes to rapid drying speed and eliminates caking. A high vacuum is maintained, while the material is in motion permitting the drawing off of moisture or vapour under desired conditions.

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Salient Features

Granular / pasty / hygroscopic / heat sensitive materials can be handled.

Operation can be carried out at Low temperature.

Solvent recovery can be carried out efficiently.

Energy efficient operation.

Indirect mode of heating.

Indirect mode of heating.

Closed operation.

RAJ Vacuum Dryer is designed so as to

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achieve fast, efficient drying of a wide variety of chemicals, pharmaceuticals and food products. The dryer is hermetically sealed for dust -free operations with no material loss and no contamination. Due to vacuum high speed drying is achieved at low temperature thus avoiding degradation of material. Low temperature drying saves utilities.

Applications:

Rotary vacuum dryers are used in pharmaceuticals, organic chemicals, pasty materials, insecticides, pesticides, solvent recovery, dye intermediates, dyestuffs, etc.

Operational Features:

The shaft is sealed to prevent loss of vacuum.

All bearings are installed outside of the drying compartment thereby, eliminating the product contamination from lubricants.

The RAJ VACUUM DRYER is gentle in action. The blades are designed such that ensures desired disintegration of cakes.

As the agitator moves the material allowing the particle to move their position continuously and the vacuum draws off moisture. There is no caking, or contamination in the RAJ RVD.

The RAJ RVD is useful for drying materials of high value. Solvents or liquids extracted from the materials being dried are recovered with the help of suitable arrangement of condensers and receivers.

Limpet arrangement can be provided in case of heating media is hot liquid.

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one screw Dryer is an equipment used

to dry the powders containing moisture or

Solvents. The construction of cone screw

dryer as the name suggest consists of

conical container with jacket or limpet in

which screw rotates about it's own axis and

revolves along the wall of cone. In some

cases a vacuum system is used.

Features of Raj Cone Screw Dryer

Excellent drying of free flowing powder

materials with low moisture content

Fast drying times as the mixing screw

continuously circulates the product from

the bottom to the top of the vessel

improving heat transfer.

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C o n e S c r e w D r y e r

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Quick and efficient removal of vapours.

Solvent Recovery System.

Low power consumption.

Low floor space required.

Dried solids are suitable for direct use.

Easy to clean.

Applications

Chemicals, Petrochemicals, Pharmaceuticals, Food, Cosmetics, Mineral, Biochemical

Fertilizer industry.

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